Mick playing great guitar helped, ... I sleep downstairs and the studio is upstairs. One night I thought I was hearing this old Muddy Waters track I didn't know, but it turned out to be Mick working on a slide part for Back of my Hand . He's always been a good, smooth acoustic player, but the electric seemed like an untamed beast for him until this year. When I heard him this time I thought, 'My God! The boy's finally got it'. Keith Richards